[gruez]

It's not contradictory. The "FX" you're talking about is used as "Athlon FX"[1], whereas the "FX" in the article is "AMD FX"[2]. The branding might be a bit confusing, but the article isn't wrong.

[1] https://en.wikipedia.org/wiki/File:AMD_Athlon64_FX.jpg

[2] https://commons.wikimedia.org/wiki/File:AMD_FX_CPU_New_logo....